As leader of the far-right U.K. Independence Party, Farage is largely credited with forcing then-Prime Minister David Cameron to hold a referendum on the country's EU membership during the U.K. election. Both Cameron and Farage stepped down from their respective roles in the referendum's aftermath.

And Farage has so much to teach Trump about politeness, patience, respect for women, and basic geography.

"You have the charisma of a damp rag and the appearance of a low-grade bank clerk," Farage told former European Parliament president Herman Van Rompuy.

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Business leaders who endorse Donald Trump

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Business leaders who endorse Donald Trump

Steve Forbes, Chairman and Editor-in-Chief of Forbes

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Peter Thiel, Venture Capitalist, co-founder of PayPal

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Kenneth Langone, co-founder of The Home Depot

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Bernard 'Bernie' Marcus, co-founder and former chairman of Home Depot

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Pete Coors, Chairman of MillerCoors

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Linda McMahon, formerly CEO of World Wrestling Entertainment

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Brian France, Chairman and CEO of NASCAR

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Herman Cain, American author and business executive

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Carly Fiorina, former CEO of Hewlett-Packard

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"Why don't you shut up and listen for a change?" he snapped at a fellow member of the European Parliament.

During an ITV debate, Farage told an audience member, "Just calm down there a little bit."

For all his rough edges, Farage is an accomplished public speaker and debater. Bringing him in suggests the Trump campaign wants to present a more focused and persuasive candidate during the next debate.

That's assuming Trump is willing to listen to Farage, of course. Ahead of the first debate, The New York Times reported Trump grew bored during his practice sessions and didn't pay attention to his briefing materials.